I've had a frustrating day wrestling with my sound recording setup. The Mircotrack 2 that I'm using seems to have toasted one of my compact flash cards, now it crashes Windows Explorer!
The problem was fixed by turning off DMA on the Microtrack recorder and now it's recording properly again. DMA is a mechanism for circumventing the CPU, while writing to memory on a different device.
Thanks to Mr Sandiford for figuring this out :)